CN109896461B - High-reliability and high-safety large-load hoister braking system and method - Google Patents
High-reliability and high-safety large-load hoister braking system and method Download PDFInfo
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- CN109896461B CN109896461B CN201910251623.9A CN201910251623A CN109896461B CN 109896461 B CN109896461 B CN 109896461B CN 201910251623 A CN201910251623 A CN 201910251623A CN 109896461 B CN109896461 B CN 109896461B
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Abstract
The invention relates to a high-reliability and high-safety large-load hoister braking system and a method, wherein the system comprises a balance valve control loop, a parking braking control loop and a safety brake control loop; the parking brake control loop is connected with the input port of the balance valve control loop through a pipeline, the other output port of the parking brake control loop is connected with the other input port of the balance valve control loop through a pipeline, and the balance valve control loop is arranged between the hoist drum drive motor and the parking brake control loop; the balance valve control loop is used for balancing the load of the hoister and realizing service braking, the parking brake control loop is used for realizing the opening and closing of the parking brake, and the safety brake control loop is used for realizing the opening and closing of the hydraulic disc brake.
Description
Technical Field
The invention discloses a high-reliability and high-safety large-load hoister braking system and a method, and belongs to the technical field of crane hydraulic control.
Background
The working reliability of the large-load hoister is related to the integrity and safety of a specific load, and has important influence on the safety of personnel and equipment, and whether the braking measure of the hoister is reliable or not determines whether the hoister can run reliably and safely.
In the braking scheme of the elevator, low-speed end braking and high-speed end braking are divided according to the position of a brake, and service braking and parking braking are divided according to the function of the brake. The current elevator braking scheme generally only has parking braking and high-speed end braking, but does not have service braking and low-speed end braking. For example, the braking measures of the conventional type of elevator adopt two high-speed end braking (parking braking) without service braking and low-speed end braking, the braking scheme cannot realize direct braking on the low-speed end (winding drum), and once an emergency situation occurs during the operation of the elevator and emergency braking needs to be implemented, the emergency band-type brake of the high-speed end brake can cause the danger of friction plate peeling and even flying out, so that hidden danger is brought to the safe operation of the elevator.
A hydraulic transmission mode is adopted for a certain large-load hoister, and the following problems which are still to be solved exist in the aspect of a braking system:
a) how to implement service braking in hydraulic hoisting machines and how to ensure service braking
Reliable operation;
b) the high-speed end and the low-speed end are braked in a limited size space, so that the safety of the elevator is ensured
Fully operating;
c) how to realize the working time sequence control of parking braking and service braking;
d) how reliable the low speed end brake works;
disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the high-reliability and high-safety large-load hoister braking system and the method are provided, and the problem of double redundancy control of crane braking and parking braking of a hoister in a limited space is solved.
The technical scheme of the invention is as follows: a high-reliability and high-safety large-load hoister braking system comprises a balance valve control loop, a parking brake control loop and a safety brake control loop; the parking brake control loop is connected with the input port of the balance valve control loop through a pipeline, the other output port of the parking brake control loop is connected with the other input port of the balance valve control loop through a pipeline, and the balance valve control loop is arranged between the hoist drum drive motor and the parking brake control loop; the balance valve control loop is used for balancing the load of the hoister and realizing service braking, the parking brake control loop is used for realizing the opening and closing of the parking brake, and the safety brake control loop is used for realizing the opening and closing of the hydraulic disc brake.
The balanced valve control loop includes: the balance valve, the electromagnetic directional valve YA9, the electromagnetic directional valve YA10 and the one-way speed regulating valve; the balance valve control loop is provided with two input ports 1-2 and four output ports 1-4; the balance valve is provided with an oil inlet, a load port, a control oil port, an oil drainage port and an oil return port; the input port 1 of the balance valve control loop is directly connected with the output port 1 through a pipeline and is simultaneously connected with a control oil port of the balance valve; the input port 2 of the balance valve control loop is connected with an oil inlet of an electromagnetic directional valve YA9 through a pipeline and is simultaneously connected with an oil outlet of a one-way speed regulating valve; an oil outlet of the electromagnetic directional valve YA9 is connected to an oil inlet of the balance valve through a pipeline; the load port of the balance valve is connected to the output port 2 of the control loop of the balance valve through a pipeline and is simultaneously connected with the oil inlet of the electromagnetic directional valve YA 10; an oil outlet of the electromagnetic directional valve YA10 is connected to an oil inlet of the one-way speed regulating valve through a pipeline; the oil drain port of the balance valve is connected to the output port 3 of the balance valve control loop through a pipeline, and the oil return port of the balance valve is connected to the output port 4 of the balance valve control loop through a pipeline.
The safety pressure of the balance valve is set to be 25 +/-0.5 MPa, and the opening pressure of the balance valve is set to be 2.8-9.6 MPa.
The parking brake control circuit includes: parking brake, shuttle valve, reducing valve, throttle valve; the parking brake control loop is provided with two input ports 1-2 and three output ports 1-3, the parking brake is provided with a working oil port, and the shuttle valve is provided with two working ports 1-2 and a signal port; the pressure reducing valve and the throttle valve are both provided with an oil inlet and an oil outlet; an input port 1 of the parking brake control loop is directly connected with an output port 1 through a pipeline and is simultaneously connected with one working port of the shuttle valve, an input port 2 is directly connected with the output port 2 through a pipeline and is simultaneously connected with the other working port of the shuttle valve, a signal port of the shuttle valve is connected with an oil inlet of a pressure reducing valve through a pipeline, an oil outlet of the pressure reducing valve is simultaneously connected with an oil inlet of a throttle valve through a working oil port of the parking brake through a pipeline, and an oil outlet of the throttle valve is connected with an output port 3 of.
And the parking brake is integrally arranged at the high-speed end in the hoisting machine winding drum.
The parking brake opening pressure requirement is lower than the opening pressure of the balance valve and the working pressure of the motor when the vehicle is lifted in an idle state.
The outlet pressure of the pressure reducing valve is set to be greater than the parking brake activation pressure.
The safety brake control circuit includes: the hydraulic brake comprises a hydraulic disc brake, an energy accumulator, an electromagnetic directional valve YA7, an overflow valve, a check valve A, a check valve B and a check throttle valve; the safety brake control loop is provided with an input port and an output port, and the hydraulic disc brake and the energy accumulator are respectively provided with a working oil port; the electromagnetic directional valve YA7, the overflow valve, the one-way valve A, the one-way valve B and the one-way throttle valve are all provided with an oil inlet and an oil outlet; the input port of the safety brake control loop is simultaneously connected to the oil inlet of the check valve A and the oil inlet of the overflow valve through pipelines, the oil outlet of the check valve A is connected to the oil inlet of the check valve B, the oil outlet of the check valve B is connected to the oil inlet of the check throttle valve, the oil outlet of the check throttle valve is simultaneously connected to the working oil port of the hydraulic disc brake, the working oil port of the energy accumulator and the oil inlet of the electromagnetic direction valve YA7, and the oil outlet of the electromagnetic direction valve YA7 and the oil outlet of the overflow valve are simultaneously connected to the output port of.
The hydraulic disc brake is arranged at the tail end of a winding drum of the hoisting machine; the pressure setting of the overflow valve is higher than the opening pressure of the hydraulic disc brake and lower than the highest working pressure of the hydraulic disc brake.
A method for braking by using any one of the high-reliability and high-safety large-load elevator braking systems comprises the following steps:
when the work starts:
firstly, starting a hydraulic disc brake;
then starting the parking brake;
finally, opening the balance valve;
when the work stops:
closing the balance valve;
then closing the parking brake;
and finally closing the hydraulic disc brake.
Compared with the prior art, the invention has the advantages that:
1) the balance valve is adopted and the design scheme of the balance valve backup loop is provided, so that the service braking of the large-tonnage hydraulic hoister is realized, the hydraulic hoister can still realize emergency action under the condition that the balance valve fails, and the service braking reliability of the hoister is improved.
2) The hydraulic disc brake is adopted, a high-reliability safety brake control loop is developed, the problem that a brake system of the conventional hoister has no low-speed end brake (safety brake) is solved, the potential safety hazard of emergency brake during the running of the hoister is eliminated, and the safety of the brake system of the hydraulic hoister is improved.
3) The technical scheme of the drum built-in parking brake is adopted, the problem that brakes at a high speed end and a low speed end are arranged in a limited size space at the same time is solved, double redundancy control of service brake and parking brake is realized, and safe operation of the hydraulic elevator is ensured.
4) A parking brake control loop is developed, automatic opening and closing of the parking brake are achieved through parameter matching, control over the working time sequence of the parking brake and service brake is achieved, and normal operation of a brake system of the elevator is guaranteed.
5) By adopting the technology of directly connecting the balance valve with the motor, the pipeline connection between the balance valve and the motor is cancelled, and the safety risk of the falling of the load out of control caused by the failure of the pipeline connection is avoided.
Drawings
Fig. 1 is a schematic diagram of a balanced valve control loop.
Fig. 2 is a schematic diagram of a parking brake control circuit.
FIG. 3 is a schematic diagram of a safety brake control loop
Detailed Description
High-reliability and high-safety large-load hoister braking system
The hydraulic elevator braking system includes: a balance valve control loop, a parking brake control loop and a safety brake control loop; the balance valve control loop is integrally installed with a hoist drum driving motor, the parking brake control loop is connected with the balance valve control loop through a pipeline, an output port of the parking brake control loop is connected with an input port of the balance valve control loop through a pipeline, another output port of the parking brake control loop is connected with another input port of the balance valve control loop through a pipeline, and the balance valve control loop is installed between the hoist drum driving motor and the parking brake control loop. The balance valve control loop is used for balancing the load of the hoister and realizing service braking, the parking brake control loop is used for realizing the opening and closing of the parking brake, and the safety brake control loop is used for realizing the opening and closing of the hydraulic disc brake.
2. Balanced valve control loop
The balanced valve control loop principle is shown in figure 1. The balanced valve control loop includes: the balanced valve comprises a balanced valve 1, electromagnetic directional valves YA94 and YA102 and a one-way speed regulating valve 3, wherein a balanced valve control loop is provided with two input ports and four output ports, the balanced valve 1 is provided with four oil ports of an oil inlet, a load port, a control oil port, an oil drain port and an oil return port, other valve parts are provided with two oil ports of an oil inlet and an oil outlet, the input port 1 of the balanced valve control loop is directly connected with the output port 1 through a pipeline and is simultaneously connected with the control oil port of the balanced valve 1, an input port 2 is connected with the oil inlet of the electromagnetic directional valve YA94 through a pipeline and is simultaneously connected with the oil outlet of the one-way speed regulating valve 3, the oil outlet of the electromagnetic directional valve YA94 is connected with the oil inlet of the balanced valve 1 through a pipeline, the load port of the balanced valve 1 is connected with the output, the oil drain port of the balance valve 1 is connected to the output port 3 of the balance valve control loop through a pipeline, and the oil return port of the balance valve 1 is connected to the output port 4 of the balance valve control loop through a pipeline. The safety pressure of the balance valve 1 is set to be 25 +/-0.5 MPa, and the opening pressure is set to be 2.8 MPa-9.6 MPa.
The hydraulic elevator utilizes the balance valve 1 to brake the hydraulic motor when the valve core returns to the neutral position, plays a role in service braking in the lowering process, and prevents overspeed movement possibly caused by overlarge load. Meanwhile, due to the load locking function of the balance valve, the hydraulic hoister can be ensured not to have the fault of out-of-control falling under the condition that other braking measures are not effective, and the phenomenon that the load quickly slips in the ditch at the moment of relieving other braking measures can be avoided.
The balance valve adopts the latest K-type end cover product of the German Buch company, can realize the sectional opening, and furthest ensures the opening stability of the balance valve. This balanced valve mounting means is for direct mount to transfer chamber load mouth (directly link with the motor) under hydraulic motor, does not pass through the tube coupling, can avoid because the safe risk of balanced valve inefficacy, the load whereabouts of out of control that the pipeline broke and arouses.
In order to avoid that the balance valve cannot be opened due to the fact that the balance valve is stuck at a large opening or the oil control port of the balance valve is blocked in the lowering process of the elevator, a balance valve backup loop (shown in figure 1) is designed and consists of an electromagnetic directional valve YA9(4), an electromagnetic directional valve YA10(2) and a one-way speed regulating valve (3), when the elevator runs in full load, a control system monitors the pressure of a cavity A and a cavity B of a motor and the running speed of the system in real time, when the working pressure is lower than a certain value or the running speed of the system is higher than a certain value, the balance valve is firstly judged to be stuck at the large opening (the probability of sudden damage of the motor is very low) according to experience, an emergency fault plan can be adopted, namely the electromagnetic directional valve YA9 and the electromagnetic directional valve YA10 are electrified, the balance valve is stopped, and the one-way speed. Similarly, when the balance valve cannot be opened due to the blockage of the control oil port, the electromagnetic directional valve YA9 and the electromagnetic directional valve YA10 can be electrified to stop the balance valve, and the bypass parallel one-way speed regulating valve is adopted to realize the emergency lowering of the elevator.
3. Parking brake control circuit
The parking brake circuit schematic is shown in fig. 2. The parking brake control circuit includes: the parking brake control circuit comprises a parking brake 8, a shuttle valve 5, a pressure reducing valve 6 and a throttle valve 7, wherein the parking brake control circuit is provided with two input ports and three output ports, the parking brake is provided with a working oil port, the shuttle valve is provided with three oil ports including two working ports and a signal port, and other valve pieces are provided with two oil ports including an oil inlet and an oil outlet. An input port 1 of the parking brake control loop is directly connected with an output port 1 through a pipeline and is simultaneously connected with one working port of the shuttle valve, an input port 2 is directly connected with the output port 2 through a pipeline and is simultaneously connected with the other working port of the shuttle valve, a signal port of the shuttle valve is connected with an oil inlet of a pressure reducing valve through a pipeline, an oil outlet of the pressure reducing valve is simultaneously connected with an oil inlet of a throttle valve through a working oil port of the parking brake through a pipeline, and an oil outlet of the throttle valve is connected with an output port 3 of. The parking brake of the parking brake control loop is integrally installed at the high-speed end in the winding drum of the hoisting machine, and the starting pressure of the parking brake is required to be lower than the starting pressure of the balance valve and the working pressure of the motor during no-load hoisting. The outlet pressure of the pressure reducing valve is set to be larger than the opening pressure of the parking brake, and the opening size of the throttle valve is set according to the closing time requirement of the parking brake.
The technical scheme of the drum built-in parking brake is adopted, the problem that brakes at a high speed end and a low speed end are arranged in a limited size space at the same time is solved, double redundancy control of service brake and parking brake is realized, and safe operation of the hydraulic elevator is ensured. The automatic opening and closing of the parking brake are realized through parameter matching, and the working time sequence control of the parking brake and the service brake is realized.
The on-off of the parking brake and the operation stop of the hydraulic motor are controlled by the same reversing valve piece. The starting pressure of the parking brake is 1.1MPa, the set pressure of the pressure reducing valve is 4 +/-0.5 MPa, and when the parking brake is started, the parking brake can be unlocked in place firstly, and then the motor starts to act, so that abnormal abrasion of the parking brake is avoided. When the hoister is in no-load operation, the highest working pressure of the motor is 1.4 +/-0.2 MPa, and the parking brake is ensured to be reliably started when the hoister is in no-load lifting. When the parking brake is closed, the hydraulic system is braked through the balance valve, after the motor stops running, the parking brake is delayed to brake, and the parking brake plays a role in supporting braking.
Parking brake sets up inside hydraulic lifting machine drum reducer reel (with drum reducer integrated mounting), is equipped with switching brake detection switch, and overall dimension is extremely small and exquisite, and braking torque can reach 680Nm (the actual required parking braking torque is 270Nm), and the braking torque surplus is great.
4. Safety brake control circuit
The safety brake control loop is schematically shown in fig. 3. The safety brake control circuit includes: the hydraulic disc brake (comprising a hydraulic disc brake A15 and a hydraulic disc brake B16 which are designed redundantly), an energy accumulator 13, an electromagnetic directional valve YA712, an overflow valve 9, a check valve A10, a check valve B11 and a check throttle valve 14, wherein a safety brake control loop is provided with an input port and an output port, the hydraulic disc brake and the energy accumulator are respectively provided with a working oil port, other valve elements are provided with two oil ports of an oil inlet and an oil outlet, the input port of the safety brake control loop is simultaneously connected to the oil inlet of the check valve A and the oil inlet of the overflow valve through pipelines, the oil outlet of the check valve A is connected to the oil inlet of the check valve B, the oil outlet of the check valve B is connected to the oil inlet of the check throttle valve, the oil outlet of the check throttle valve is simultaneously connected to the working oil port of the, the oil outlet of the electromagnetic direction valve YA7 and the oil outlet of the overflow valve are connected to the output port of the safety brake control circuit at the same time. The hydraulic disc brake is arranged at the tail end of a winding drum of the hoist, the pressure setting requirement of the overflow valve is higher than the opening pressure of the hydraulic disc brake and lower than the highest working pressure of the hydraulic disc brake, and the inflation pressure requirement of the energy accumulator meets the requirement of a safety brake control loop.
A large-torque hydraulic disc brake is adopted, a high-reliability safety brake control loop is developed, the problem that a brake system of a conventional hoister has no low-speed end brake (safety brake) is solved, and low-speed end self-redundancy control is realized. The potential safety hazard of emergency braking during the operation of the hoister is eliminated, and the safety of a braking system of the hoister is improved.
When the hydraulic disc brake is opened, an oil inlet circuit is opened to charge pressure to a hydraulic disc brake circuit, the electromagnetic direction valve YA7 needs to be electrified, the hydraulic disc brake can be opened when the pressure reaches above 17.5MPa, the oil inlet circuit can be closed, the hydraulic disc brake circuit is controlled by an energy accumulator and a one-way valve (the charging pressure of the energy accumulator is 13.8 +/-0.5 MPa), the hydraulic disc brake circuit is ensured to be in an opening state, and when the hydraulic disc brake is closed, the electromagnetic direction valve YA7 is powered off. In order to improve the reliability of a control loop, a double one-way valve series redundancy design is adopted, and control faults caused by leakage of the one-way valves are reduced to the maximum extent. The one-way throttle valve is arranged in the oil inlet pipeline, so that the phenomenon that the brake of the hydraulic disc brake generates large impact when the oil inlet pipeline is suddenly pressurized is avoided.
The hydraulic disc brake is arranged at the tail end (low-speed end) of a winding drum of the hydraulic hoist, two sets of SHI107Fc hydraulic disc brakes of German Western Berry are selected to be arranged in parallel, the opening pressure of the brake is 17.5-20 MPa, the braking torque of a single brake can reach 35880Nm, the braking torque (including load acting force and motor acting force) required by the hydraulic hoist during emergency braking is 30598Nm, namely the hydraulic disc brake can still realize the low-speed end braking of the hydraulic hoist on the premise of one failure, and the safety and reliability of braking are ensured. The hydraulic disc brake is provided with an opening and closing brake detection switch for judging the system flow.
5. Brake system operating sequence
When the hydraulic system is started in normal work, the hydraulic disc brake is firstly started, then the parking brake is started, and finally the balance valve is started.
The invention is not described in detail and is within the knowledge of a person skilled in the art.
Claims (9)
1. A high reliability and security heavy load lifting machine braking system which characterized in that includes: a balance valve control loop, a parking brake control loop and a safety brake control loop; the parking brake control loop is connected with the input port of the balance valve control loop through a pipeline, the other output port of the parking brake control loop is connected with the other input port of the balance valve control loop through a pipeline, and the balance valve control loop is arranged between the hoist drum drive motor and the parking brake control loop; the control loop of the balance valve is used for balancing the load of the hoister and realizing service braking, the control loop of the parking brake is used for realizing the opening and closing of the parking brake, and the control loop of the safety brake is used for realizing the opening and closing of the hydraulic disc brake;
the balanced valve control loop includes: the balance valve (1), the electromagnetic directional valve YA9(4), the electromagnetic directional valve YA10(2) and the one-way speed regulating valve (3); the balance valve control loop is provided with two input ports 1-2 and four output ports 1-4; the balance valve (1) is provided with an oil inlet, a load port, a control oil port, an oil drainage port and an oil return port; the input port 1 of the balance valve control loop is directly connected with the output port 1 through a pipeline and is simultaneously connected with a control oil port of the balance valve (1); the input port 2 of the balance valve control loop is connected with an oil inlet of an electromagnetic directional valve YA9(4) through a pipeline and is simultaneously connected with an oil outlet of a one-way speed regulating valve (3); an oil outlet of the electromagnetic directional valve YA9(4) is connected to an oil inlet of the balance valve (1) through a pipeline; the load port of the balance valve (1) is connected to the output port 2 of the control loop of the balance valve through a pipeline and is simultaneously connected with the oil inlet of the electromagnetic directional valve YA10 (2); an oil outlet of the electromagnetic directional valve YA10(2) is connected to an oil inlet of the one-way speed regulating valve (3) through a pipeline; an oil drain port of the balance valve (1) is connected to an output port 3 of the balance valve control loop through a pipeline, and an oil return port of the balance valve (1) is connected to an output port 4 of the balance valve control loop through a pipeline.
2. A high reliability and safety heavy load elevator braking system as claimed in claim 1, wherein: the safety pressure of the balance valve (1) is set to be 25 +/-0.5 MPa, and the opening pressure of the balance valve (1) is set to be 2.8-9.6 MPa.
3. A high reliability and safety heavy load elevator braking system as claimed in claim 1, wherein: the parking brake control circuit includes: a parking brake (8), a shuttle valve (5), a pressure reducing valve (6) and a throttle valve (7); the parking brake control loop is provided with two input ports 1-2 and three output ports 1-3, the parking brake (8) is provided with a working oil port, and the shuttle valve (5) is provided with two working ports 1-2 and a signal port; the pressure reducing valve (6) and the throttle valve (7) are both provided with an oil inlet and an oil outlet; an input port 1 of the parking brake control loop is directly connected with an output port 1 through a pipeline and is simultaneously connected with a working port of a shuttle valve (5), an input port 2 is directly connected with the output port 2 through the pipeline and is simultaneously connected with another working port of the shuttle valve (5), a signal port of the shuttle valve (5) is connected with an oil inlet of a reducing valve (6) through a pipeline, an oil outlet of the reducing valve (6) is connected with a working oil port of the parking brake through a pipeline and is simultaneously connected with an oil inlet of a throttle valve (7), and an oil outlet of the throttle valve (7) is connected with an output port 3 of the parking brake.
4. A high reliability and safety heavy load elevator braking system as claimed in claim 3, wherein: and the parking brake (8) is integrally arranged at the high-speed end inside the hoisting machine winding drum.
5. A high reliability and safety heavy load elevator braking system as claimed in claim 3, wherein: the parking brake opening pressure requirement is lower than the opening pressure of the balance valve and the working pressure of the motor when the vehicle is lifted in an idle state.
6. A high reliability and safety heavy load elevator braking system as claimed in claim 3, wherein: the outlet pressure of the pressure reducing valve (6) is set to be greater than the opening pressure of the parking brake (8).
7. A high reliability and safety heavy load elevator braking system as claimed in claim 1, wherein: the safety brake control circuit includes: the hydraulic brake comprises a hydraulic disc brake, an energy accumulator (13), an electromagnetic directional valve YA7(12), an overflow valve (9), a check valve A (10), a check valve B (11) and a check throttle valve (14); the safety brake control loop is provided with an input port and an output port, and the hydraulic disc brake and the energy accumulator (13) are respectively provided with a working oil port; the electromagnetic directional valve YA7(12), the overflow valve (9), the one-way valve A (10), the one-way valve B (11) and the one-way throttle valve (14) are all provided with an oil inlet and an oil outlet; an input port of the safety brake control loop is simultaneously connected to an oil inlet of a check valve A (10) and an oil inlet of an overflow valve (9) through a pipeline, an oil outlet of the check valve A (10) is connected to an oil inlet of a check valve B (11), an oil outlet of the check valve B (11) is connected to an oil inlet of a check throttle valve (14), an oil outlet of the check throttle valve (14) is simultaneously connected to a working oil port of a hydraulic disc brake, a working oil port of an energy accumulator (13) and an oil inlet of an electromagnetic directional valve YA7(12), and an oil outlet of the electromagnetic directional valve YA7(12) and an oil outlet of the overflow valve (9) are simultaneously connected to an output port of the safety.
8. A high reliability and safety heavy load elevator braking system as claimed in claim 7, wherein: the hydraulic disc brake is arranged at the tail end of a winding drum of the hoisting machine; the pressure of the overflow valve (9) is set to be higher than the opening pressure of the hydraulic disc brake and lower than the highest working pressure of the hydraulic disc brake.
9. A method for braking by using any one of the high-reliability and high-safety large-load elevator braking systems is characterized by comprising the following steps of:
when the work starts:
firstly, starting a hydraulic disc brake;
re-activating the parking brake (8);
finally, opening the balance valve (1);
when the work stops:
firstly closing the balance valve (1);
re-closing the parking brake (8);
and finally closing the hydraulic disc brake.
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| CN201910251623.9A CN109896461B (en) | 2019-03-29 | 2019-03-29 | High-reliability and high-safety large-load hoister braking system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1086789A (en) * | 1992-11-08 | 1994-05-18 | 铁道部兰州机车工厂 | Hydraulic driving system for single hook double hoisting crane |
| CN201132745Y (en) * | 2007-11-06 | 2008-10-15 | 泰安市硕力液压设备厂 | Hydraulic lifting device for column crane |
| CN201228685Y (en) * | 2008-05-26 | 2009-04-29 | 长治清华机械厂 | Hydraulic system of lorry-mounted crane |
| CN201321358Y (en) * | 2008-11-25 | 2009-10-07 | 徐州重型机械有限公司 | Crane hoist control system and crane |
| CN101734565B (en) * | 2008-11-25 | 2011-04-06 | 徐州重型机械有限公司 | Crane and winch control system thereof |
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